tach issue

synergy

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I have a 2013 GL2274. my tach gauge fluctuate readings. The rpm sounds nor the speed on the motor does not change. How do I test??? Is it the gauge, wiring, or in the motor.
 
I have a 2013 GL2274. my tach gauge fluctuate readings. The rpm sounds nor the speed on the motor does not change. How do I test??? Is it the gauge, wiring, or in the motor.
I’m not electronically inclined but I found this. Hope it helpshttps://goneoutdoors.com/test-tachometer-signal-boat-7901792.html
 
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